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In the sixth grade, I drew inferences from others in mathematics, and knelt down to ask someone who knew the answer for help.
Set the swimming pool to be x meters long,

When two people meet once, the total distance of traveling together is 2X, and the total distance of meeting for the third time is 6x.

Then the meeting time is 6x/(1+0.6) = 3.75x;

Then the distance traveled by A is 3.75x *1= 3.75x;

After two people meet, A needs to swim 2x more than B;

Then the time required for chasing and meeting is 2x/(1-0.6) = 5x;

Then the distance traveled by A is 5x *1= 5x;

According to the distance traveled by A, the chasing and meeting path is exactly 5 swimming pools long, while the opposite meeting path is 3.75 swimming pools long.

The length of swimming pool is 45/0.75 = 60m.

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